Location of draincock on radiator.

The car makers have done away with the drain cocks on lots of rad, due to saving a few pennies and now you just take off the bottom radiator hose to drain it , it will do the same job, all you will see is where the drain cock used to go ,

I have a 2002 trailblazer am lppking to change the coolant,does this radiator have a drain pulg and where is it?

To reiterate kbky's post, NOT ALL RADIATORS HAVE A PETCOCK.

If you do not have a petcock, take a hacksaw blade and saw off a five gallon bucket to just shoter than fitting under your car while it is on ramps.

Make sure the bucket is clean, and if you have coolant that is "healthy" and green, save it for later.

Proceed to fill the system with water, and the radiator flush of your choice.

Warm the car to 200 degrees Farenheit, and as soon as it comes to temperature, idle the motor for three minutes, or 205 degrees, whichever comes first.

If you have a multimeter with a temperature sensor, or a pal who does, you will know exactly when to shut down the engine.

Let the motor cool for quite a while to solidify any solids dissolved in the radiaor flush, which is what you have just done. Around 100 degrees Farenhiet. Start and Run it until it the temp is about 180 degrees F, shut down the engine, bleed the pressure from the radiator, if any, allow it to cool to a working temperature, and drain off the contents. Don't burn yourself! After that, flush out the radiator from the fill, and the upper hose with a garden hose, and of course make sure the hose is off the bottom. This will rinse out any particulates in the bottom of the radiator.

This will flush the system, as water is the "Universal Solvent".

Fill the cooling system with 50/50, and run it normally.

So much for detailed trade secrets to get the most bang for your buck.

Complex this is, I know. But, in the long run, the radiator may last longer than the car, if maintained properly.

This answer was edited by the_mekanic 201 days ago.

Reason: ed